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Capacitors - Technical MCQs

Q1:

What is the reactive power in the given circuit?

A 0 VAR

B 691 mu.gifVAR

C 44.23 mVAR

D 1.45 kVAR

ANS:C - 44.23 mVAR

Given : F = 5 kHz; C = 0.22F
Where XC = CAPACITIVE LOAD.

XC = 1/ (2 * π * F * C).
XC = 1 / (6.28 * 5 * 103 * 0.022 * 10-6)
XC = 1 / 0.6908 * 10-3
XC = 1.4475 * 103 = 1447.5Ω.

P = V * I.
P = V2 / R or P = V2 / XC.

Here:
P = V2/XC.
P = 64 V / 1447.5,
P = 0.04421 Var.
P = 44.21 m Var.